That's happened to me. Happened about an hour ago. The common denominator is that I am usually either surfing the web, or running another app when a call comes in. Today I was on a website streaming video when the call came in. Had to do a battery pull after that. I guess it's probably a low memory issue

Not exactly, but I took a similar route. I have Autokiller Memory Optimizer running, using a combination of Pete's, and GirLuvsDroid's recommended settings: 7, 10, 12, 28, 32, 32. I am also running Swapper 2, and have a 64 MB swap file set up, with swappiness set to 10.

I am running PE 5.0.2 (obviously, LOL), with Chevy's latest lv 1.1 kernel, and compcache is disabled. So far, everything has been great- nice and smooth, no apps closing on me without warning, and only 1 random reboot that I can think of in the week or so since I got everything set up this way, but I just shrugged it off and haven't had one since. Can't figure this vibrating phone FC out though! A battery pull is usually required to stop it.